Plastering machine



Nav. A1o", 1925.

piled nay 11, 19'25 4 sheets-sheet 1 GeorgeJwrzrad;

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Nav. 1o, 1925.

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av; 1ol 1925.

G. J. CONRAD.

PLASTERING MACHINE 4.: Sheets-Sheet 4 Filed lay 11, 1925 s UNITED "s-'rrxrsl Patented Nov. 19.25. i

anonce J. Colman, or

BALTIMORE,

marraine nem.

aypiieauon inea nyil, 1925. serial no. 29,595..

To all t concern:

. thscharacterwith a return passage from' .terial passes to the Be it known that KI, GEORGE J.-C0N1mn, a

citizen ofthe United States, residing at' Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Plastering Machinesfof which the following is a specification.

This invention relates to plastering ma chines, and especially to an improved 'form of powerdriven machine for? forcing plaster or otheriplastic material through a conducting tube mto a room or rooms, and into contact with all parts of the walls, ceilings, etc. of such rooms where the plastic material is to be applied.

One object of thisinvention is to provide a machine of this character with a very positive and exceedingly eicient and' practical form of force pum which receives the plasti'c material from t e ho per, andv forces such material into a valved ut otherwise tightly sealed chamber from which such plastic mavarious points o f application. Y l A Another object is to'provide a machine of the sealed chamber'tothe hopper, and to .provide means 'to open a valve or gate in such return passage' simultaneously with closin a valve or gate in the passage or conduit t on h which .the plastic material is where? era form'of'eombined'nozz Y feed conduit, for applyings Y ceilings, etc'.

the plastic material on wa or Other objects and important features will be pointed out :or implied in the following details of description, .in connection a ans part 'brokeh'out of the the accom an 'dr'awlngsnwhichzlis plan view of the machine, art being b e'n out of lthe' baselate,

' conL duitfand 'the exiblexshaft.. Fig. 2 is aside elevation of the' machine, a part of the feed vconduit and of the dexible shaft being B s-a horzontal'sectionaldetail view E in .the planeofthe centersofthe plungers provide an improved e andrtrow'el on saidl and vspreading or pistons which force the material into the sealed chamber, and thence through the feeding conduit and return conduit or passage, according to the ositions of the valves or gates in such conduits. Y

Fig. 4 is a transverse vertical sectionV in the plane indicated at 4-4 of'Figs. 1 and 3.

Fig. 5 is an enlarged fragmentaldetail 'view of the sealed chamber and its connections with the adjoining'elements of the machine. A i l Fig. 6 is 'an enlarged detail view of the feed-controlling valve or gate and its op` erating mechanism.

Fig.`7 s an enlarged sectional detail view l" of the driving gear, and of the driven gear which isl connected to one of the plungers or pistons, .the section being taken-along the .y l

ne 7-7 ofl Figurel.

Fig.

moved by movement of the. driving 8 is a view similar to Fig. 7, and, taken in the same plane, but showing the ar in itsposition of rest, whereas ows it in its meshing position with afl'. Fi 9 is a vertical sectional view, the section ing taken in the line 9 9 of Fig. 1'. v

Fig-'10 is an enlarged side view of the nozzle andtrowel combined. e

Fig. 11 is an end' view ofthe lstructure y shown in. Fig. 10, b'ut reduced in size.

Referring to these drawings in detail, in which simllar reference characters correspond to similar" parts throughout the sev'- eral views,- and in which the present draw.-Y

L ings illustratev one of the numerous forms covered by the inventive ideas, the presentA form is described in detail as follows:

On a base 1, whichmay be mounted on wheels (not shown), a.A plurality of sup frames 2, 3, 4 and 5 are securedo screws or other appropriate means, and these unite with the basel to constitute a main frame of the; machine. The frame-member 2linclu'des or is rigidly united with a hoplin ersor pump cylinders 8. These cy inders or tubes'8 are lpreferably connected 6 a sealed chamber-7 and two ,bya bridge 9whichprevents plastic ma- 1 terial4 from passing between them, and the I'are primarily open at both ends, but each 17s provided" with a ate orfcheck valve 10 across the end whic communicates with the interior ofthe sealed chamber 7. The other'.

closed by one of the two forcing devices,

and each of these forcing devices comprises a hollow cylinder or tube 11 and a plunger or piston 12. For operating these two forcing devices, two gearing' mechanisms are employed, and as these two gearing mechanisms are of counterpart construction, the. description of one will suiiice for both, and such description is as follows:

A guiding rod 13 slides through a bearing in the frame member 3, and a connectingrod 14 is pivotally connected to the guiding rod 13, also operatively connected with an eccentric 15 which is carried by a shaft 16. A second eccentric 17 is mounted on the -shaft 16, and one end of this shaft carries a crank 18. This crank has the same set and the same throw as the eccentric- 17, and takes the place of an additional eccentric 17. In other words, thefunction of these two elements 17 and 18 is the same, viz, operatively connecting with the cylinder or tube 11 through the medium of guiding rods 19 and connecting rods 20 and 21. The crank 18 is used because it is less expensive than eccentric 17, and on the other hand, the

eccentric 17 is used because it is on the intermediate part of the shaft 16, where a crank such as shown at 18 could not be used. In this connection it may be wellA to explain that the eccentric 17 and crank 18 are in fixed position with respect to one another and with respect to a gear-wheel 22, all three of these elements being fixed to rotate withthe shaft 16; but the eccentric 15 is in fixed relation to a gear-wheel 23,A 011 a sleeve 24, this sleeve being mounted to rotate on the shaft 16. The gear wheels 22 and 23 are of the mangle gear type, sometimes 0 known as mutilated gears, having 4gear teeth formed only a part of the way around its circumference, the other part of its circumference having formed thereon twoV enlarged teeth 23 which are connected by and merge with a concave part 26 v (Figures 2, 7 and 8). The construction and form of the gear wheel 23 is substantially the same as that of the gear wheels 22, and these gear wheels mesh respectively with driving gear wheels 27 and 28, that is, the driven gear wheel 22 meshes With the driving gear wheel 28, and the driven gear-wheel 23 meshes with the driving gear-wheel 27. Y

The driving gear-wheels 27 and 28 are fixed with'relation to one another and with -relation to ay shaft 29 with which they rotate, this shaft beingl driven' by means of a spur-gear 30 or by other appropriate means 6 for connecting the shaft 29 with any suit- 9 'table-form of engine, motor or other prime mover.` This shaft 29 is mounted. in suitable bearings which form'elements of the framemember 5. Having previouslyv referred to the gearing .of counterpart construction and having de- `of the respective driving gears to the respective driven gears, the latter are caused to alternately rotate and rest while the driving gear-wheels continuously rotate under the influence ofthe actuating gear-wheel 30 and shaft 29. The construcion of each driving gear-wheel is subsantially the same as n that of the other gear-wheel, but the setting or arcuate position of each driving gearwheel is different from the setting or arcuate position of each of the other driving gear-wheels. This difference in settings or arcuate positions being necessary to perform the alternate operating movements necessary for the most efficient pumping or forcing of the plastic material from the feeding tubes 8 into the sealed chamber 7. In this connection, it should be understood that each feeding' tube 8 is provided with an opening 8a which communicates with the hopper 6, and that the plastic material passes bygravity and by suction from the hopper into each tube 8, through the respective openings 8a.

The operation of the mechanism thus far' described is as. follows: Assuming that th'e eccentrics 15 and 1 and the cranks 18 (Fig. 1) are on dead center, the plungers or pushers 12 are both at their outermost position, and one of the tubular members' 11 is at vits outermost position, but the other one is at its innermost position. This same relation of parts 1s shown also in Figure 3, where it is seen that the forwardmost member 11 contains a consider'able hollow space in its front end. However, assuming thatthe hopper A6 was filled withx plastic materialv when this member moved to its forward position, and `Seeing that the corresponding opening 8a admitted plastic material into the space below said opening, it will be also understood that the forward movementof this member 11 closed the corresponding opening 8a, at the same time causing this descended plastic material to fill the front end of the member 11. Again calling attention to the construction and relative positions of 'the mangle gear wheels, and to the fact that the eccentrics of this ,forcing mechanism are respectively in their foremost and rearmost positions, it will now be seen that when the driving gear wheels are turned over toward the rear of the machine, (erin a clockwise direction), the eccentric will move-from its rearmost to its foremost-position, thereby forcing the plungeror piston 12 forward,

and this forces the plastic material from the tubular member 11 into thel sealed chamber 7; Assuming that this chamber was already filled with the plastic material, a correspond- K ing amount Aof said material passedv either material while closing the ope stationary through the gate of the feeding tube, or

through the gate of the return tube, which tubeswill presently be described. It should be understood that the v4corresponding .gate 10 QpenedA to admit the lastic material passed into the chamber aiidthat the other gateV 10, being closed, prevented return of the plastic 'materiaL therethrough. Now

that the plunger 12 has reached its fore- .most position, the corresponding gear wheel 2v2`is moved' (by its driving gear wheel 28) from its position of rest, and 'as it rotates .for'lbringing the member r11 rearward, for

opening the outlet 8", the corresponding wheel 23 is also rotated for causing its eccen-A tric 15 to bring the lunger 12 rearward with this member 11,' w ereu n the relation of the-members 11 and 12 is thesame as that f Vshown in the one vv(of the two counterpart.-

mechanism) nearer the observer in Figure 1.

"While the farther one of these two mechanisms was'operating as just previously described, the nearer one of these mechanisms reverses lts relation, or assumes the sition here shown. by the farther one. .other words, now consideringthe operation of the nearer one of-these mechanisms, and assuming that the space at 8 isliilled with plastic material, the gear-wheel 22 of this nearerA in its idleposition in consequence of the' smooth part of the-driving gearj27A sliding in the concave part 26 of the corresponding drivengear; but now, when this inembei` 11' has-reachedits forward ition, vit is held .by a similar. 'ding engagement ofthemdriving gear-2 8 with the concave part 26 of the corresponding 'gear-wheel22; and

new, while this member 11l remains. tem

rarily stationary, the teeth; ofthe driving gear 27 .(oflthi's nearer mechanism) mesh. with those of the correspondingv member 23,'

.causing vthe latter to rotate and carry the adjacent eccentric 15 forward for causing .the corresponding plun rtopush the ma.-

terial from the front en of this member 11 into the sealed chamber 7.' A

From the foregoing, it will be' seen that I each of the members 11 and 12 operates and rests alternately while all the lwheels 27 and v28 continue torotate.

also the openings 8* are alternately :opened and alternately closed bythe y members 11,' and that eachmember- 11 and its corresponding lunge'r 12 moves. rearf -ward .simultaneous y, thus creating -a suction which assists gravity in forcing the plastic material through the openings 8l into the spaces below` these openings.v

An important object of thislinvention .is i to enable the pumping or )forcing'device to continue operating without forcing the plastic material to the points .of application ,when the operator desires to temporarily discontinue plastering oi'.` applying theplastic material and a further o ally mix the plastering material when it is not being app i )ect is to continu-- ed, and thus keep. it in proper condition. In carrying: out these objects, 1 provide a return passage'or tube 34 having a` .f

gate therein.. The rear vend of this passage 34 is secured to the hopper 6 in position to empty or discharge into the hopper. The

feeding pipe-or passage 36 isprovidedwithv a gate 37. A rod 38 operatively connects.

with thgates v5 and 37 in 'such relation that'wlieneither of these gates is open, the other 1s closed. The gate 37 is provi ed with a .gearingmechanism 39, comprisin two intermeshing gear wheels, and one o these gear-wheels is rotatable with the-glate ft 4o.

while the other is rotatable with s a This shaft '.40 includes a llexiblglpart 40"l which extends approximately from end to end .of the feeding tube 36, Vwhiclrjlatter` is also flexible, and y`apiro riate bear'4 are provided for the exi le shaft 40, these bearings bein mounted at suitable intervals.

on the feed pipe 36.` 'A handle 42 is mounted on the outer end of the flexible shaft 40,

which outer end ispivotally mounted at 43,

having itsbearingin a se ent 44,which forms an element'of a ratc et, the'pa'wl of the ratchet being indicated at 45.. This pawl Iis carried by the handle42`and vis normally pressedby a. sprin 46. .'The incline of the ratchet teethis'suc `that the handle held against any comparatively slighttendency o the" flexible shaft'40 to turn, but b exerting a considerable force on the hand el;

42, the h ol tendency of the ratchet is. overcome, and y means of this.handle the flexible shaft 40. can be turned for opent' the gearing 39 and thereby ope mg orfclos'-v ing thegate 37, at the same tiine `c osing or opening the te85. As soon as the handle" 42 is turned or closing the gate37, it simultaneously opensthe gate 35` whereupon the iow through the lastic material ceases 4to eed pipe 36, and begins to flow through the return 4pipe 34.

The ratchet-segment 44 isli'xed `on a nozzle 'i is provided with ati'ewelV 47, andv this nozze 48. This trowel is ferably provided .with aremovable wear-p te 4 8, as shown'n Figures 10 and 11, and the outer surface of this wear-plate-s preferably slightly the adjacent ,part of the flattened nozzle-mouth.

'materlal towards the trowel, but also tendv.ing to avoid any space through which the material can pass at the oppositel side of the nozzle from the trowel. By referringv vto Figure 11, it will be seen that the endsof the nozzle-mouth are more capacious than the middle part thereof, thus effecting the desirable. spreading of the plastic material immediately before it encounters the trowel. The nozzle 47 is provided with handles 50, these handles being preferably bailshaped, and the hand-rolls 50 thereof extend transversely of the nozzle and in spaced relation thereto. They extend from the same sideas that from which the segment 44 extends, so the handle 42 is in the most convenient relation with respect to these two supporting and wielding'handles 50. f

In operating a machine of this character, all parts thereof except the tube 36 and parts carried thereby, may be located on the Ground or pavement outslde of the building eing plastered; and the free end of the feedln tube extends through a door or window o the building. The main art of this feeding tube may e supported y any appropriate means (not shown) while the nozzle 47 is wielded by the handles 50 for applying the plastic material and for causing the trowel 48 to spread the plastic material. In practice, the i nozzle 48 may be used for merely roughly-applying the plastering material, while an assistant plasterer may follow with appropriate finishing tools for smoothing .or leveling the plaster thus applied. For plastering relatively tall buildings, this machine may be elevated to the upper part of the building, together with its driving engine or motor, and the feeding tubeJ36 may extend down into the differenty rooms to'` be plastered.

The prepared plastering material may be introduced into the hopper 6 by any appropriate means (not-shown) such means being no part of this inventio I have no intention of limiting my patent protection to the exact details of construction 'and arrangement here shown, for the inventive ideas include various constructions and arrangement of parts within the scope of the claims. n

What I claim as my invention is:

1. In a plastering machine, the combination of a hopper, a sealed chamber, a valved passage to permit plastic material to pass from the hopper to the sealed chamber and to prevent return of the `plastic material from the sealed chamber, means to confine a quantity of plastic material in said `passage, and means to push the thus confined plastic material-from said passage into said sealed chamber, said sealed chamber having an outlet, and a feeding tube for receiving the plastic material from said outlet and conveying it toa point of delivery or applic-ation of the plastic material.

2. The structure defined by claim 1, a gate in said outlet, said sealedV chamber having a second outlet, a gateA in the second outlet, means connecting vthese gates in such relation that eachI is closed when the other is open,` means to operate the second said means for opening and closing these gates, and a return passage for conducting'plastic lmaterial from the second said outlet back into said hopper, for the purpose specified.

3. In a device of the character described, the combination of a hopper, a sealed chammeans and being operable to force the confined material into said sealed chamber, and

and a gearing mechanism operable to alternately operate the said means and to alternately operate said pushers, said sealed chamber being provided with an outlet for delivery of said material.

In testimony whereof I aiiix my signature.

GEORGE J. CONRAD. 

